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Back to 15.4 Carnot’s Perfect Heat Engine: The Second Law of Thermodynamics Restated

15.4 Exercise 6

Avg difficulty 2.5

(a) What is the hot reservoir temperature of a Carnot engine that has an efficiency of 42.0% and a cold reservoir temperature of 27.0ºC\text{27} . 0 º \text{C}? (b) What must the hot reservoir temperature be for a real heat engine that achieves 0.700 of the maximum efficiency, but still has an efficiency of 42.0% (and a cold reservoir at 27.0ºC\text{27} . 0 º \text{C})? (c) Does your answer imply practical limits to the efficiency of car gasoline engines?

OpenStax College Physics 2e, 15.4 Carnot’s Perfect Heat Engine: The Second Law of Thermodynamics Restated, exercise 6

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.